Topic module

Nine Classes, Hazards and Divisions

Distinguish the hazards, divisions, packing groups and environmental characteristics across all 9 UN classes.

Long-form learning

Concept to Risk to Memory to Check-up

Learn where rules live, practise applying them to complete facts, show the decision path and give precise references when the paper requests them.

Core concepts

Concept 1

Class criteria

Exam cue: Classify from physical, chemical, toxicological or radiological properties before considering containment or mode.

Concept 2

Divisions

Exam cue: Locate the class-specific criteria and confirm any division, packing group or subsidiary-hazard threshold.

Concept 3

Primary and subsidiary hazards

Risk pitfalls and guardrails

Relying on a familiar product name instead of the published classification criteria.

Guardrail: Do not infer a current live item count from a sample booklet or apply a rule from the wrong transport mode.

Memory anchors

What is the core aim in Nine Classes, Hazards and Divisions?

Distinguish the hazards, divisions, packing groups and environmental characteristics across all 9 UN classes.

What is a dependable method for Nine Classes, Hazards and Divisions?

Classify from physical, chemical, toxicological or radiological properties before considering containment or mode.

How should the regulatory reference be checked for Nine Classes, Hazards and Divisions?

Locate the class-specific criteria and confirm any division, packing group or subsidiary-hazard threshold.

What common error should be avoided in Nine Classes, Hazards and Divisions?

Relying on a familiar product name instead of the published classification criteria.

What makes a DGSA answer complete for Nine Classes, Hazards and Divisions?

State the conclusion, show the relevant decision steps, and provide the precise regulatory reference when requested.

Checkpoint rule

Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.

Knowledge Check (after reading)

Short check-up to confirm understanding of this module.

1-2 question checkpoint

Which Class 1 division presents a mass-explosion hazard?

Which Class 2 division identifies toxic gases?

Answer all questions to submit.

Next step personalized recommendations

Move forward only after this module is stable.

What is Pass Harbor?

Completely free exam prep for 247 UK exams.

“No more expensive exam prep. Quality study tools should be accessible to everyone.”